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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7102b0fee183879910db72fbcfdab14a853bed5b0bd666bac4d454b7680694fc' 
  AND token = '0ldN2PHCN8aa/KoO3Xihl2UW86VwMvDrcuM4vha/Wis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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