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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1abe93864e7184e201157fe1290b10bc78c5b139358deb3225cdd7881d8a416' 
  AND token = 'vCQg17VaW/4ovxL54Sfz6Sgfaj3WB27Rdtvmbe5LiYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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