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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5753ebeb48b377eb44eb746d1350a660bab7fa42b63c8dd3c6fb3fa6e409437c' 
  AND token = '30c2Ff2czXvS87Ql+i8sBJJoMLlK7uD/Daab5c2YPHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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