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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f923ce4248ebcef7060f0b04872a13311e61670bd6e41c1517df06691b5f17a' 
  AND token = 'phw7FJINwMr2PD3g5dGrp6p+EMfzOELF8dvsRSnQ8hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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