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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a45753c22a88b12c2fde09b47fe821a0733ed6aea02feb92f9ba84843d1d614' 
  AND token = '6cS2HpDzL1Slt1XfCRh6n7sdLtgTe4J/Ri0DG2KtG1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}