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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0977d860e6d048c80b416754bf6461dcbd955d1f838f166b6c88820893e81199' 
  AND token = 'Jld1B78zpg6tcj2Se6whwswcQH2y8WCNG+zsOd1Keo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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