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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcf17be6f895851fef284eea1e461126b2f395cba6c032c88f23b155f3a5dfb' 
  AND token = 'NLs0ldAGdckGGlvGLuvPGoucGj0LejNCJboy5g8yfVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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