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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc0b04c3844b0b6982f34c6e0d832858d9b87dfcc8ce0e0f5e2b08f791f5860' 
  AND token = '7UCz3n/PpWlsqMBd33HOLnE1liK32UQg19cg6Tzkgkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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