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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1777e46ccf72cf06079f84ecb27f7fc3a2f670ab6435f61e5bc41968ac2333a' 
  AND token = 'DTV20ExMLZXNwAi1Hs5JI8IojxrJO5yhPNoc+JuJA+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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